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These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. Truck has an active P0300 code and runs very rough. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. Its not GMs choice to use AFM. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. I can tell you for the past 2 years I changed out my LC9 5.3L fully synthetic oil every 3,000, even though Mobile Oil claims 10,000 miles or more. If thats the case, Summit Racing has dedicated truck cams that will increase power through the rangebottom to topbut the meat of it is in the mid-range where your engine spends the most time. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? I am not in a position to have a new cam and lifters installed but Im also not in a position to not having a running truck! Had nothing but trouble out of it. The oil-pressure controlled system that operates the special lifters is VERY prone to failure, if the oil is not changed on time, OR if the wrong oil is used. I called my service station and they told me to get it in ASAP. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. [] Here is a guide on how to turn off AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Guide to disabling AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Here is an article on how to deactivate AFM. The lifter came apart and chewed up the lobe on the cam Im selling it I also told my friend at work when he asked me about my truck .I said Ill never by another GM ever. This system was originally used in early 1980s Cadillacs. Hi my name is noel I am a mobile mechanic and I have a client that was having trouble with the lifters on a 2011 gmc yukon Denali 6.2 I placed the lifters after finishing I still had a problem with cylinder 8,6,3 rocker arms were not moving so I replaced the cam OEM part but still having miss fire on cylinder 6 what should I do to get rid of this problem, [] computer cannot switch over to four-cylinder mode. im going to plug in a dissabler when im done to keep it V8 mode all the time. Corvette that does employ AFM. When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. The dealer in Rockhill, SC when asked only said they had not had a problem. Was thinking maybe I could trick the ruck into thinking the engine was not warmed up, however, this might cause some problems for other processes, such as mix ratio and timing. However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. I recently bought a low mileage 2013 Silverado and the lifters collapsed. how many miles do you have on your engine? Since it is not costing me anything out of pocket, I did not go with the Delete Kit (did not want to spend the money). Perhaps a flaw by design would be a more appropriate description . Our 2013 yukon with 47k miles just failed. Clean oil is crucial. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. 2 15 with 5.3 Sierras both with 100k and 1. Found that all passenger side cylinders are not firing. Truck ran fine before that. If you want to delete it entirely, its a M14 x 1.5 pipe plug or you could use the Improved Racing plug p/n IRP-814-M14-Kit. However, the fuel savings are not always as much as expected. []. NOT GOOD!! If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Love the truck so far. As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. I noticed this discussion mainly addresses Chevy Silverados and other trucks? Definitely dont want to do anything to fix one problem and create another. Just one. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. The result is improved combustion chamber pressure as the piston approaches top . Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Number 7 cylinder lifters stops moving when truck starts. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. Hopefully he can free up the stuck/collapsed lifter. Send response to tkrieg@cox.net. The motor I pulled was a 2007 LY5 with about 77k on it. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. Was a disaster then but a profitable disaster. This is what I keep telling people. On the AFM lifters that dosnt work i have installed them With the oil hole Down! Everything was fine for two weeks, ow customer complains s it same noise it made as before. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? With 44, its a enormous Jon to remove the oil pan. They may be able to find some of those missing ponies. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. I have a 2007 Gmc Envoy Denali with LH6 cant find a good LH6 engine but I found a 2011 LC9 engine w 52000 miles will everything plug up or what am I getting into? Ditto , never buy a throw away vehicle again is my recommendation and my fix . I just took a long trip and it used 1.5 quarts of oil. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. I dont know where to being to look for the problem. Learn how your comment data is processed. I have a 2007 Yukon XL with the 5.3L and am planning to do this as my lifters have failed and it rattles loudly if it starts, and runs limp. Ketil, let us know what you find out. The only solution is to replace the entire cylinder head. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. Thanks. Then it takes out the lifter again and again until you bite the bullet and replace the cam. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. Junk . General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. Help appreciated. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. I am hoping this does the trick. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. Loved the looks and interior and thought a I got a great deal at $6k even. Any advice that you could offer would be great. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. I have no clue what to do now. has 92,000 miles and was just told I have cam and lifter failure. Put everything back together proper torque, gakets, valve seals, etc. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Then I guess I have to spend a bunch of money and get the delete kit. 2015 SILVERADO 1500 44 crew cab with 5.3L engine: So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. Is this the shield you referred to in a past post? All eight cylinders are now powering the engine. Seafoam with syn oil change only fixed for a week. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Well, they move a couple of times after startup thats all.Asume its the same on syl 7 on the other side.Disconected the Connector to the solenoids, no difference. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. Hello. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. GM uses 3 different styles all are engine specific. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. I have already dropped a lot of money on this truck (08 suburban). If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. Will the plug in deactivater fix the oil consumption or will it cause more consumption? Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. Ive been reading, with disgust and concern of the lifter/cam situation. Any help would be appreciated. so the trans fluid worked for you then? New plugs and wires. A tuner can often fix that as well by giving it some more ignition advance in these regions. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! 50,000 miles. I have only put about 600 miles on it and noticed that the oil was a bit low and am hoping that it was that way when I picked it up. Replaced all lifters on passenger side as well as pushrods for even wear. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . Delete the AFM, buy a tuner/chip, take it to a performance place and get an actual tune done that fixes it, replace the AFM lifters with non AFM type, change other engine components with thisetc..etc..etc??? . Having a hard time finding one .. If the 4th cylinder lifter has failed, would driving it damage the engine? Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. If buying a tuner/chip which works best for that truck/engine? Here are a few of the issues that you'll want to keep on your radar if you drive a 2017 Chevy or GMC vehicle with a 5.3L engine in it. This is my second Avalanche and I never had any issues with either of them. Didnt change exhaust nor tune so likely no change in power/torque. bought at Brian Tooley Racing ! Traded it with 180K miles and did not experience any problems. The LFA was upgraded with AFM and [], [] improvement over AFM, DFM has 17 different cylinder firing patterns and switches seamlessly between them to provide just []. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Is the Pressure relief valve replaceable? Yes thats true. Thanks for the detailed post! Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. Solenoids, new lifters also test voltage to solenoid pack all good their, Hi Grant is that disabler still working for you ? This new lawsuit is essentially identical to the previous. I have a noise in the engine but it seems to go away when revved up. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. GM should recall every vehicle with this terrible design flaw! Every one of these engine will have a lifter fail, this is a travesty! My fear now is not will it happen but when! [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. 2 15 with 5.3 Sierras both with 100k and Most of all, my concern is reliability. AFM - active fuel management strategy which deactivates the lifters on specific . It seems this tough engine has everything incorporated into it. With 40000 The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. Teflon coatings does not last. Does the Pressure relief vavle ever go bad?? Took it to a shop and they advised that it could be due to the AFM system not functioning properly. There may be an ignition related issue on that cylinder. This basically deactivates the cylinder deactivation system. also in the pan is another AFM oil filter near the external engine oil filter. The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. Please report back if you have any issues, but I think you are in good shape. I am worrking on a 2007 chev Silverado 6.0 engine, [] the L76 that was equipped with AFM and had a ribbed valley cover, the L98 cover was []. But then she passed away from cancer. Only running on drivers side cylinders. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. Would it be fine to go ahead with the AFM Disabler? Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Sylinder one lost compression on my 09 5,3. . The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Some drivers want V8 power under their foot at all times. Logic says that it should not as the ECM isnt programmed to use AFM, but will it see a lack of resistance from no solenoid pack plugged in? If you already own this engine you will need to deactivate the AFM system or even better DO NOT buy any GM vehicle with this engine. She had driven it for a couple of months that way. [], [] way. . I wear hearing aids, but I thought I heard more engine noises, but after checking the gas cap, the light went out for a week. Very expensive repair too! I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. On one hand it has an aluminum block, which is nice. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). Have not had a problem yet. Required fields are marked *. GM's Active Fuel Management (AFM) works under certain light load driving conditions to maximize fuel economy by deactivating 4 of the engines 8 cylinders. How is that an improvement. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. AFMengines use special lifters for cylinders 1, 4, 6, and 7. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes Toyota has their own problems. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. With 40000 The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. I plan on getting a tuner to disable the AFM. The engine is running on only four cylinders. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. I will keep reading and take notes. This happened on a camping trip with my kids last friday night. When you drain the oil at three to four thousand miles its still clean. Apparently all passkey III keys are not the same,, I bought one that said for 2006 impala assuming all pk3 would be the same, and I could not get it programmed in my saab 9-7,, so how Im waiting on ones that specially said for saab 9-7. hoping they will work. While the system sounded good, the microprocessors scrambled to activate, deactivate, and then reactivate cylinders as driving conditions quickly changed, causing the car to hesitate, buck, and stall. That inherently less smooth operation requires additional NVH dampening. The detergent. is it still working good since you have done that with the trans fluid? Ill Never Ever buy another gm. AFM sucks Im paying for a truck that has broke down twice replace the cam and lifters and now its broke down again 105000 miles never heard of that in a 350 Chevrolet. Brian, I have the same question as Scott. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy How do you know if the lifter has failed? Now I get 24 to 26 with deactivation locked out and full power. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Thank you for your time. any help? There is no light on my dash or anything that indicates the system is active or exists, so its very confusing, Im still not sure if my vehicle has it or not.